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Aviation History
1956
1956 - 1472.PDF
624 FLIGHT, 12 October 1956 r.p.m. or 375ft per minute—must be used for machining, and thetool will require frequent sharpening. A good smooth surface can be provided by sanding and finishing; the tubing can be suppliedwith a sanded-off finish if required. Vickers-Armstrongs and Folland are among firms mentioned as users of "Nu-Glas" forvarious purposes. New Dunlop Dynamometer AT Coventry on October 2 the Dunlop Rubber Co., Ltd.,**• aviation division gave a "private view" of their new dynamo- meter to a group of technical journalists, and in two demonstrationtests showed its impressive capabilities for putting aircraft tyres, wheels and brakes through their paces. Each test simulated a normal braked landing run. The firstwas of a well-established brake design, of the two-cylinder, two- plate type incorporating chromium-plated copper plates. Thiswas tested at a landing wheel load of 13,500 lb, a "brakes-on" speed of 127 m.p.h., with a kinetic energy of 6,450,000 footpounds, and a tyre, wheel and brake volume of 6? cu ft. It was very instructive to compare this test with the second,which demonstrated even more strikingly the dynamometer's potentialities. In this case one of the latest designs was used asa "model," a multi-cylinder, two-plate brake employing inorganic linings and steel plates. (Together with a narrow tyre and wheelsection, this compact unit has been developed for retracting into the thin wing of a supersonic aircraft.) Relevant figures from the second test made an interestingcomparison with the first. For here, though the wheel load was lighter (13,200 lb), the brakes-on speed was considerablyhigher at 157 m.p.h. And while the k.e. was much greater— 10,000,000 foot pounds—the volume of tyre, wheel and brake hadbeen decreased to 2\ cu ft. The dynamometer consists, basically, of a large inertia flywheelof variable weight, with horizontally movable carriages mounted on either side. A tyre, wheel and brake assembly is attachedto one of the carriages and brought into contact with the wheel, which is driven by a 400 h.p. D.C. motor and at the maximum560 r.p.m. achieves an equivalent of 200 m.p.h. The dynamometer installed at the Coventry works of the Dunlop Rubber Co., Ltd. (see accompanying description), following the testing run of a wheel and brake unit. As the maximum k.e. value developed by the machine at fullflywheel weight and r.p.m. is 66 million ft lb, it is clear that the dynamometer has sufficient capacity to meet the greater brakingloads which may be required in the future, particularly for land- ings and the rejected take-off by high speed aircraft. The Coventry dynamometer, in the words of a companyspokesman at the demonstration, "will enable Dunlops to meet all international test requirements." The whole assembly, whichweighs approximately 160 tons, has cost "well over £100,000." It is of American design and took two years to construct. IN BRIEF Mr. J. W. Howlett has relinquished the office of chairman andmanaging director of Wellworthy, Ltd., a subsidiary of Associated Engineering Holdings, Ltd., but remains on the Board. Mr. A. J.Woolcott has been appointed chairman and managing director of Wellworthy, Ltd. * " :*: I'.."*'.; '•'- _ . - Mr. C. R. D. Tuckey, general sales manager of British Timken,Ltd., is visiting British East Africa, Rhodesia, South Africa, Aus- tralia, New Zealand and Canada on his third world tour. Thesecountries provide some of the principal markets for British Timken products. -:•' •...-.•-. -•••-. The plastics division of Saro Laminated Wood Products, Ltd., Folly Works, Whippingham, East Cowes, Isle of Wight, has produced a handsome brochure describing its work in the field of reinforced plastics, which have achieved widespread applica- tion in the aircraft industry. * * * The Institute of Welding, 2 Buckingham Palace Gardens, Buck- ingham Palace Road, London, S.W.I, has just published a booklet entitled Health and Safety in Welding. This is available at 2s per copy (Is 6d for 20 copies or more), for members; or 3s per copy (2s for 20 or more), for non-members, all prices including postage. * * * Mr. Alan R. Turner has been appointed western projectsengineer for the Photographic Survey Corporation, Ltd., and its new engineering associate, Hunting Technical Services, Ltd., ofToronto. Previously assistant to the manager of the Western Division of P.S.C. at Vancouver, Mr. Turner will now be based in Calgary. * * * T.C. Spray Finishing Systems, 5 St. James's Place, London,S.W.I, announce that sales and service facilities for S.F.S. Bede "Econ-o-Matic" paint heaters have been augmented in variousparts of the country. A leaflet is available describing the heaters, for which T.C. Spray Finishing Systems have sole manufacturingand distributing rights in this country, the Commonwealth, and certain European territories. * * * The Compoflex Co., Ltd., has decided to extend its range ofmetallic flexibles to include light and heavy flexible cable trans- missions of the push-pull and spring-return types, and alsospeedometer and tachometer cables. Plant has been installed at the factory in Huddersfield Road, Oldham, Lanes, to give aninitial production capacity of over 10,000 assemblies a week. Meanwhile the company's Flexibles Advisory Service at 23-25Northumberland Avenue, London, W.C.2, has published a com- prehensive catalogue on light and heavy spring-return types offlexible cable controls. * * * In connection with a reconstruction scheme being undertakenby Brysnbo Steel Works, Ltd., near Wrexham (a subsidiary com- pany of Guest, Keen and Nettlefolds, Ltd.), orders have beenplaced for three 40-ton Birlec Lectromelt arc furnaces at a total cost exceeding £300,000. The furnaces are to replace the com-pany's existing open hearth plant. * * * A new type of reducing valve, the PS. 64, has been added to therange of those already manufactured by the Hymatic Engineering Co., Ltd., Glover Street, Redditch, Worcs. The PS. 64 reducesinlet pressures of between 150 and 3,000 lb/sq in to lOin w.g. and controls this outlet pressure to within ± 3in w.g. at all flowsup to 90 cu ft/min. It weighs 2.72 lb and can also be used over the same inlet range to give outlet pressure up to 10^ lb/sq in. * * * A new British Standard, B.S. G.152, specifies requirementsfor the general and detailed construction and for the accuracy of electrically operated artificial horizons; it also includesinformation on testing. This standard replaces that part of B.S. G.I 10 relating to electrically driven instruments; an up-to-datespecification to replace requirements of that standard relating to air-driven instruments will be published shortly. Copies of G.152may be obtained from the B.S.I. Sales Branch, 2 Park Street, London, W.I, price 3s 6d. * * * Several new appointments within the Northern Aluminium Co.,Ltd., sales department have been announced. Mr. D. W. Taylor, formerly assistant manager of the sales development division, hassucceeded Mr. G. A. Vernon, who has retired, as head of the Birmingham area sales office. Mr. D. A. Pinn, previously incharge of the Bristol sales office, has been appointed export sales manager and is succeeded at Bristol by Mr. H. M. Louch, fromwhom Mr. H. Q. Lievesley takes over management of the Leeds area sales office. At Southampton, Mr. D. L. Roper becomesmanager of the regional office with effect from October 1, in succession to Mr. N. P. Campbell, who is to attend a year's courseat the Centre d'Etudes Industrielles, Geneva.
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